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Figure 8: Position 'D' measures diffuse reflectance only. Position 'S' measures total

reflectance by including the specular component.

The sphere has five ports:

1. Sample beam transmission port (19 x 17 mm)

2. Sample measurement port (16 mm diameter)

3. Reference beam port (11 x 13 mm)

4. NIR detector port (11 mm diameter)

5. PMT port (oval, 30 mm long x 14 mm wide)

The PMT, PbS and InGaAs detectors are mounted on top of the sphere, which is

alternately illuminated by sample and reference beams.

Beam image dimensions:

transmission port 11.04 mm (h) x 13.44 mm (w)

reflectance port 12.50 mm (h) x 7.11 mm (w)

Figure 9: The beam through the accessory

The reference disks supplied with the accessory are 6 mm deep and the powder is

added to a density of 1 g/cm

. This is the optimum thickness and density of PTFE, to

ensure maximum reflectivity(3) and therefore the best absolute accuracy.

Specifications

+ 85 volts DC (Cary

4000/5000/6000i)

DRA 900 DRA 1800 DRA 2500

Cary 4000

200 nm to

900 nm *

200 nm to

900 nm

200 nm to

900 nm

Cary 5000

200 nm to

900 nm *

200 nm to 1800

nm *

200 nm to

2500 nm *

Wavelength range

Cary 6000i

200 nm to

900 nm *

200 nm to

1800 nm *

200 nm to 1800

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Mantis 5000 Specifiche Pagina 10